以固態反應法合成Sr2MgSi2O7:Dy3+螢光體之發光特性研究

Photoluminescence properties of Sr2MgSi2O7:Dy3+ phosphors prepared by solid state reaction

林彥廷(Yen-Ting Lin)

指導教授 ： 唐自標

國立臺北科技大學/工程學院/材料科學與工程研究所/碩士(2009年)

摘要

本實驗是以固態反應法合成摻雜Dy3+為激活劑的Sr2MgSi2O7螢光體。探討以不同的冷卻處理方式對其光激發光特性之影響。以X光繞射儀(XRD)鑑定結晶相；以螢光光譜儀(PL)檢測螢光體之光激發光特性；以掃描式電子顯微鏡(SEM)觀察表面形貌。
合成螢光體的起啟原料為SrCO3, MgCO3, SiO2 and H3BO3。其中H3BO3是被當成助熔劑使用，因此所佔比例較小。將起啟原料利用磁石攪伴均勻混合4小時，均勻混合後的粉末於1350℃下燒成4小時，燒成結束後將其磨碎。所得到的粉末和Dy2O3利用一樣的方法混合均勻, 再利用不成的溫度燒成1-4小時後進行爐冷或是急速冷卻處理。
在大氣環境下燒成Sr2MgSi2O7: Dy3+螢光體，以350nm之紫外光波長激發，得到黃光(575nm)、藍光(480nm)之放射峰，符合4F9/2→6H13/2 、4F9/2→6H15/2之電子躍遷，而急冷處理下Dy3+摻雜量大約4mole％時有較佳之發光強度。

關鍵字

螢光體 ； Sr2MgSi2O7 ； Dy3+ ； 固態反應法

並列摘要

The purpose of this study is to compare the effects of quenching and furnace cooling on the luminescence properties of solid-state reaction method synthesized Sr2MgSi2O7: Dy3+phosphor.

The structure and morphology of phosphor particle and their PL properties were studied by means of X-ray diffractometer (XRD), scanning electron microscope (SEM) and photoluminescence spectrometer(PL).

The starting materials include the following chemicals: SrCO3, MgCO3, SiO2 and H3BO3. Small quantities of H3BO3 were used as a flux. Powders were mixed homogeneously by magnetic stirring for 4h. The milled powders were fired at 1350℃ for 4h,then pulverized. Powders and Dy2O3 were mixed homogeneously by magnetic stirring. The milled powders were fired at different temperature for 1-4h by quenching or furnace cooling.

Under air atmosphere, the synthesized Sr2MgSi2O7: Dy3+ Phosphor showed a yellow(575nm) and blue (480nm) emission with 350nm excitation, which corresponds to 4F9/2→6H13/2 and 4F9/2→6H15/2 transitions, respectively. And after quenching process, the intensity of the phosphor reach to its maximum with 4 mole％ Dy3+ concentration.

並列關鍵字

phosphor ； Sr2MgSi2O7 ； Dy3 ； solid-state reaction method

參考文獻

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